Pulley-rim.



rTn STATES PATENT omucn.

PULLEY-RIM.

Specification of Letters Patent.

Application filed June 10, 1913. Serial No. 772,883.

To all whom it may concern:

Be it known that T, JOHN D. CRAWFORD, a

citizen of Canada, residing at Camlachie, in the Province of Ontario and Dominion of Canada, have invented new and useful Improvements in Pulley-Rims, of which the following is a specification.

This invention relates to an extension ri-m which is adapted to be applied to the rim of a small pulley in order to increase the diameter of its effective outer periphery, and has for an object to provide a device of this character which may be applied readily to the rim of a pulley without detaching the same from the shaft upon which it may be mounted, and which embodies adjustable means for rigidly securing the extension rim in position upon the pulley so that danger of slipping is obviated.

A further object of the invention is to provide an extension rim of the class described which includes a plurality of seg ments adapted to be arranged together so as to encompass the rim of the pulley to be built up, and adjustable means for clamping the said segments together upon the pulley rim.

A still further object is the provision of an extension rim of the construction just described, wherein the adjustable clamping means for the rim segments is readily accessible for the purpose of adjustment.

The invention consists in the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawing in which:

Figure 1 is a side elevation of a pulley wheel, showing the rim applied thereto; Fig. 2 is a top plan View of the same; Fig. 8 is a vertical sectional view taken on line 33 of Fig. 2; and Fig. 4 is a horizontal sectional view on lined-4 of Fig. 1.

In the drawing, the numeral 1 designates the extension rim which is adapted to be mounted upon the outer periphery of a small pulley wheel 2 so as to increase the size of the same. This rim is comprised primarily of two coacting sections 3 and 4, which, as shown are semi-circumferential and have their ends meeting. Each rim section is composed of a plurality of abutting segments 5 which are constructed preferably of wood or of some similar material,

and which are provided with alining openings'6 adjacent to the ends thereof for the reception of the semi-circum:terentially extending clamping rods 7 The extremities of these rods project past the ends of each rim section and are connected with adjustable clamping devices which will be presently described.

At each joint between the rim sections, a pair of binding segments 8 and 9 is provided. The meeting faces of these segments contact evenly with each other as at 10, but the opposite faces thereoi are provided with cut away portions 11 and 12, which are arranged in staggered relation to each other and leave the sustaining abutments 18 and 14-. which engage the adjacent end segments l5 and 16 of the respective rim sections. The abutments 13 and 1 1 of one binding segment are thus disposed directly opposite to the cut away portions or access spaces 12 and 11 respectively provided in the coacting binding segments. The rod openings 6 in the segments of one of the rim sections are disposed in staggered relation to the openings in the segments of the coacting section, so that the openings in the segments 01 one section are in direct alincment with the openings 17 and 18 provided in the adjacent binding segment 8 and the openings 19 and 20 in the bindin segment 9 at one of the joints between sections. The binding segment openings 17 and 19 at this joint extend through the abutment 14 in the segment 8 and into communication with the cut away portion 11 of the segment 9, and the openings 18 and 20 extend throughthe abutment 13 on the segment 8 and into communication with the cut away portion 12 of the segment 9 respectively. The corresponding extremities of the clamping bolts 7 passing through this particular rim section project through the openings in the binding segments and the respective cut away portions in the segment 9 into the auxiliary openings 21 provided in the end segment of the other rim section, which is disposed in contact with the abutments of the binding segment 9. Clamping nuts 22 are adjustably mounted upon these rod extremities which are ex ternally threaded as at 28, and are disposed within the cut away portions of the segment 9, wherein they are accessible to a Patented J une 16, 1914.

wrench or other turning tool by which they diameter to produce a larger pulley of a pre- 50 may be adjusted so that each segment 9 determined diameter.

-will bind the adjacent segment 8 against Having thus described my invention, what the correspondlng end of the particular run I claim is: sectlon referred to. 1. An extension run for pulleys compris- The rod openings provided in the other ing a plurality of semi-circamferentially ex- 55 rim section are disposed in direct alinement tending sections adapted to have their ends with the openings 24 and 25 provided in the disposed in spaced relation to each other, binding segment 9 at each joint and with the clamping rods projecting from the ends of openings 26 and 27 respectively in the cothe said sections, a pair of binding segments acting binding segment 8. These openings disposed between the adjacent ends of the 60 in the binding segments extend through the sections and provided with openings receivcorresponding abutments of the segment 9 ing the said rods, and an adjustable nut and communicate with the adjacent cut threaded onto each end of each rod and enaway portions of the segment 8 and are in gageable with one of the binding segments alinement with the auxiliary openings 28 of each pair on the face thereof opposite to 65 provided in the end segment of the rim secthe coacting binding segment, each of said tion, previously dealt with, in engagement binding segments being provided in its face with the abutments of the segment 8. The opposite to the enacting segment with a reextremities of the binding rods 7 projectcess opening through an outer face thereof ing through these openings are threaded as for the reception of the corresponding bind- 70 at 29 for the reception of the clamping nuts ing nut.

30 adjustably mounted thereon and en- 2. An extension rim for pulleys comprisgaged with the binding segment 8 within its ing a plurality oi semi-e1rcumferential seccut away portions. tions adapted to have their ends disposed in From the foregoing description it will be spaced relation to each other, each of" the 75 seen that the rim sections are provided with said sections being provided with axially interlocking clamping means, whereby the spaced openings extending longitudinally segments of each section will be bound totherethrough, the openings of one section gether securely and the sections themselves being positioned so as to be staggered with will be firmly united upon the pulley to be relation to the openings of the coacting sec- 30 built up, when the clamping nuts, just detion when the sections are assembled, clampscribed, are tightened. hen these clamping rods extending through the openings of ing nuts are loosened upon their respective each section and projecting therefrom, a

bolt ends, the rim sections and their segpair of binding segments disposed between ments will be loosened so that the rim may adjacent ends on": the said sections and being 85 be removed readily from the small pulley provided with openings through which the by longitudinal movement, when the said rods of both sections extend, and clamping pulley is mounted upon the free end of a nuts threaded onto the ends of the said rods shaft. vVhen this is not the case, the clampand being adapted to bind the binding seging nuts may be adjusted so as to work off ment at the end of one section between the 90 the ends of the clamping bolts at one joint said end and the coacting binding segment. between the rim sections thereby opening In testimony whereof I aliix my signature this joint and permitting the removal of the in presence of two witnesses.

extension rim by lateral movement. TOHN D ORAVFORD Extension rims constructed in accordance with the invention, may be produced in va- Witnesses: rious sizes so that a rim may be procured IDA L. Ri-ronns, for use 1n bullding up any pulley of a given J. I. CARTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. O. 

